Rustless alloy steel



Patented Nov. 1, 1927.

UNITED ,STA'S.

1,647,491 OFFICE.

JOHN TIfOMAS WHITELEY, F BROOKLYN, NEW YORK, ASSIGNOR OF' ONE-HALF 'lO EDWARD JOHN SPINKA, OF NEW YORK, Y.

- nUs'rLEs s ALLOY STEEL.

No Drawing.

This invention; has reference to an alloy steel and. has for its principal object to pro-.-

vide an improved alloy steel which shallbe highly resistant to corrosion .so as to be substantially rust-proof and which shall be I tough, hard, malleable, readily workable and consequently suited for all general purposes such as for cutlery, dies, castings, valves, etc. The property of chromium, when included in a steel alloy, of resisting staining and corrosion is well-known, and various alloys including chromium for this purpose have beenproposed. Such alloys have been, generally speaking, capable of some particular use only (such for example as cutlery) .and have even when employedfor such purpose possessed some inherent disadvantage.

I have discovered that an alloy comprising iron, chromium, nickel, silicon, copper, zir- .20 conium,titanium and carbon is capable of use for all general purposes, ispractically rust-proof under all ordinary conditions and can be hardened, forged tempered and in short subjected to whatever treatment or operation is required for obtaining the article or apparatus in view. Thus when cutlery is to 'be made fromthis alloy it can be hardened, tempered and polished as desired and will take a sharp cutting edge.

' and the remainder iron.

For the majority of uses, however, I

- that a narrower range of proportions can be stated, such for instance as g I a i Per cent.- Chromiumun 5 1309 Nickel; 1. to4 Silicon L 1 to4.

Copper -1 to3 Zirconium 0.5 to2 Titanium); 0.5 to2 Carbon 4- 0.1 to 0.4 with the remainder iron.

Application filed July 19,

1926. Serial 1 \To..123,596'.

.The proportions will,'of course, vary according to the article to" be madeor the use to which the alloy is-to be put, but for guid ance I will give hereinafter some typical examples which I have found from 'experi-qm ence to be eminently satisfactory. Thus I have used for 'castings and the remainder iron.

For blanking dies a higher percentage of copper and silicon is desirable and for this purpose the following are my preferred proportions I Percent. Chromium 8.5 ickel 2.

opper L 3.1 'Silicon L 2.1 so

Carbon 0.3;- Zirconium 1. Titanium' 0.5'

and the remainder iron.

. For valves I prefertouse the'following i I Percent. Chromium ;8.5 Nickel l I 2.5

For cutlery I find the-fol1owing proportions are most"suitable: v

. 7 Percent. Chromium 8.75 Iickel 3.

opper s 1.

, Silicon 2. a Carbon 1- 0.4. Zirconium 1." 1 Titanium; 1. I

' and the remainder iron.

My improved alloy steel is also usefulv for the manufacture of linings for ice-boxes, meat;hooks, choppers, golf stick heads, etc.

and for such purposes the following is the formulaI prefer P81 cent.

Chromium .i 8.5 I Nickel 3.1 Copper 2.5 Silic0n 2.5 Carbon 0.15 Zirconium 1.75 Titanium 1.

and the remainder iron.

Itis to be understood that all the above are given by way of example .only and are not to beconsidered restrictive. Broadly speaking, the inclusion of the copper, nickel, chromiumand carbon mainly affects the physical properties of the. resultantalloy While the zirconium, silicon and titanium appear to act as deoxidizing agents. It will be noticed particularly that copper is included in all the examples and I regard this as an essential and important ingredient.

When given a perfect melt a steel is produced of high resistance to all corrosion producing agents at the sametime possessing hardness, toughness and high tensile strength. The parts mentioned herein are by Wei ht. What I claim and desire to secure by ettersPatent is An alloy steel comprising chromium 8.75 per cent, nickel 3 per cent, copper 1 per cent, silicon 1.5 per cent, carbon 02 per cent, zirconium. 0.75 per cent, titanium 0.5 per cent, with the remainder iron.

JOHN THOMAS WHITELEY. 

